I mailed a very light journal media mail and received notice that USPS adjusted the rate for being underpaid -- more than doubling the charge from approximatly 4.60 to 9.80. Is there a way to dispute this? Thanks.

@fast-and-friendly-books-and-more2017 Empty journals (such as the Weight Watchers journal which you sold) are not considered to be books under USPS Media rules. They are considered to be equivalent to personalized diaries, which also are not considered to be Media.